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Monthly climate in Itoshima, Japan

Last updated: July 31, 2025

Under the Köppen–Geiger climate classification Itoshima features a humid subtropical climate (Cfa). Temperatures typically range between 8 °C (46 °F) and 29 °C (84 °F) through the year, but rarely can drop to -1 °C (30 °F) or can rise to as high as 36 °C (97 °F). The average annual precipitation amounts to about 1756 mm (69.1 inches) and receives 134 rainy days on the 1 mm (0.04 inches) threshold annually. Itoshima enjoys an average of 3073 hours of sunshine throughout the year, and daylight varies from 9 hours 57 minutes to 14 hours 19 minutes per day.

Monthly average temperatures in Itoshima, Japan

The warmest months in Itoshima are July, August and September, with daily mean temperatures ranging from 25 to 29 °C (77 - 84 °F) throughout the day. The coldest temperatures usually occur in January, February and December, when daily mean temperatures range from 8 to 9 °C (46 - 49 °F) throughout the day. On average each year, Itoshima experiences 103 days above 25 °C (77.0 °F) and 1 days below 0 °C (32.0 °F).

Monthly average temperatures with daily means, minimums and maximums for period, average high and low temperatures in Itoshima. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to June 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Maximum17°C
(63°F)		20°C
(68°F)		21°C
(71°F)		26°C
(79°F)		28°C
(83°F)		31°C
(88°F)		35°C
(95°F)		36°C
(97°F)		34°C
(94°F)		30°C
(87°F)		24°C
(75°F)		23°C
(74°F)
Mean maximum15°C
(59°F)		16°C
(62°F)		20°C
(67°F)		23°C
(75°F)		27°C
(81°F)		29°C
(84°F)		33°C
(91°F)		35°C
(95°F)		32°C
(90°F)		29°C
(84°F)		23°C
(73°F)		18°C
(64°F)
Average high10°C
(50°F)		11°C
(51°F)		14°C
(58°F)		18°C
(65°F)		23°C
(74°F)		26°C
(79°F)		29°C
(85°F)		31°C
(89°F)		28°C
(82°F)		23°C
(74°F)		18°C
(64°F)		12°C
(54°F)
Daily mean8°C
(46°F)		8°C
(46°F)		11°C
(53°F)		15°C
(60°F)		20°C
(68°F)		23°C
(74°F)		27°C
(81°F)		29°C
(84°F)		25°C
(77°F)		20°C
(69°F)		15°C
(59°F)		9°C
(49°F)
Average low5°C
(41°F)		5°C
(42°F)		8°C
(47°F)		12°C
(54°F)		17°C
(63°F)		21°C
(70°F)		25°C
(77°F)		26°C
(80°F)		23°C
(73°F)		18°C
(64°F)		12°C
(53°F)		7°C
(45°F)
Mean minimum1°C
(35°F)		1°C
(34°F)		4°C
(40°F)		7°C
(45°F)		12°C
(53°F)		18°C
(64°F)		22°C
(71°F)		23°C
(74°F)		18°C
(65°F)		13°C
(55°F)		7°C
(45°F)		3°C
(37°F)
Minimum-1°C
(30°F)		-1°C
(31°F)		4°C
(39°F)		6°C
(43°F)		11°C
(51°F)		17°C
(63°F)		20°C
(68°F)		21°C
(69°F)		17°C
(63°F)		12°C
(54°F)		6°C
(42°F)		1°C
(35°F)

Compare climate in Itoshima with other places

Compare temperature, precipitation, sunshine, UV index in Itoshima, Japan with other places around the world.

Monthly average precipitation in Itoshima, Japan

Itoshima usually has the most precipitation in July, August and September, with an average of 15 rainy days and 270 mm (10.6 inches) of precipitation per month. The driest months in Itoshima are January, November and December. On average, 61 mm (2.4 inches) of precipitation falls during these months.

Monthly average precipitation and precipitation days in Itoshima. Generated using Copernicus Climate Change Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Average precipitation mm (inches)60 (2.4)78 (3.1)121 (4.8)112 (4.4)155 (6.1)184 (7.3)321 (12.6)285 (11.2)204 (8.1)111 (4.4)51 (2.0)71 (2.8)
Average precipitation days (≥ 1 mm)81011811131814151079

Monthly sunshine hours in Itoshima, Japan

The sunniest months in Itoshima are May, July and August, when the sun shines an average of 9 hours 26 minutes a day. Least sunny months in Itoshima: January, February and December receive an average of 6 hours 53 minutes of sunshine daily.

Mean monthly sunshine duration, average sunshine hours per day and mean daily daylight hours in Itoshima. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2017 to January 2022.
 JanFebMarAprMayJunJulAugSepOctNovDec
Mean monthly sunshine hours178232262280292279280304256253236215
Mean daily daylight hours10h 11m10h 57m11h 58m13h 0m13h 53m14h 19m14h 6m13h 20m12h 21m11h 19m10h 25m9h 57m

Solar UV radiation in Itoshima, Japan

Itoshima experiences the highest level of ultraviolet (UV) radiation in April, July and August, when the maximum UV index can reach values of 11 - 12, which corresponds to the Extreme category of sun exposure. January, February and December are in the Moderate / High exposure category. In these months, the maximum values of the UV index do not exceed 6. For more detailed information, check out our hourly Itoshima UV Index data.

Average daily maximum UV levels by month for Itoshima. Generated using Copernicus Atmosphere Monitoring Service information. Data for period from January 2022 to January 2023.
 JanFebMarAprMayJunJulAugSepOctNovDec
UV Index (month maximum)468111111121211764